쉽게 풀어쓴 C언어 express 11장 연습문제

1.

#include <stdio.h>

 

int main()

{

int x = 0x12345678;

unsigned char *xp = (char*)&x;//x의배열주소를char형으로*xp포인터로넘김

printf("바이트순서:%x %x %x %x\n", xp[0], xp[1], xp[2], xp[3]);//각각배열을출력

return 0;

}

 

 

 

 

2.

#include <stdio.h>

 

void get_sum_diff(int x, int y, int *p_sum, int *p_diff)

{

*p_sum = x + y

*p_diff = x - y

return 0;

}

int main()

{

int x, y;

printf("x와y의값을입력하시오:");

scanf("%d %d", &x, &y);

get_sum_diff(x, y,&x,&y);

printf("합: %d\n차: %d\n", x, y);

}

 

 

 

 

3.

#include <stdio.h>

#include <stdlib.h>

#include <time.h>

void array_fill(int *A,int size)

{

int i;

 

for (i = 0; i < size i++)

{

A[i] = rand();

printf("A[%d]=%d\n", i, A[i]);

}

}

int main()

{

int A[10];

srand((unsigned)time(NULL));

array_fill(A,10);

}

 

 

 

 

 

4.

#include <stdio.h>

void array_print(int *A,int size)

{

int i;

printf("A[]={");

for (i = 0; i < size i++)

{

A[i] = i + 1;

if (i == 0)

printf("%d", A[i]);

else

printf(", %d", A[i]);

}

printf("}\n");

}

int main()

{

int A[5];

array_print(A,5);

}

 

   

 

 

5.

#include <stdio.h>

void convert(double *grades, double *score, int size)

{

int i;

 

for (i = 0; i < size i++)

{

score[i] = (100 * grades[i]) / 4.3;

printf("score[%d] %5.2f점\n", i, score[i]);

}

}

int main()

{

double score[10];

double grades[] = {4.3, 3.7, 4.2, 4.0, 3.8, 3.2, 4.1, 4.0, 3.9, 3.5};

convert(grades,score,10);

}

 

 

 

 

 

 

 

 

6.

#include <stdio.h>

#include <stdlib.h>

#include <time.h>

void array_copy(int *A, int *B, int size)

{

int i;

for (i = 0; i < size i++)

{

B[i] = A[i];

printf("A[%d]=%d B[%d]=%d\n", i, A[i], i, B[i]);

}

}

int main()

{

int A[10] = { 0 };

int B[10] = {0};

int i;

srand((unsigned)time(NULL));

for (i = 0; i < 10; i++)

{

A[i] = rand() % 100;

}

array_copy(A,B,10);

}

 

 

 

 

 

 

 

 

7.

#include <stdio.h>

#include <stdlib.h>

#include <time.h>

void array_add(int *A, int *B, int *C, int size)

{

int i;

for (i = 0; i < size i++)

{

C[i]= B[i]+A[i];

printf("A[%d]=%3d B[%d]=%3d C[%d]=%3d\n", i, A[i], i, B[i],i,C[i]);

}

}

int main()

{

int A[10] = { 0 };

int B[10] = { 0};

int C[10] = { 0 };

int i;

srand((unsigned)time(NULL));

for (i = 0; i < 10; i++)

{

A[i] = rand() % 100;

B[i] = rand() % 100;

}

array_add(A,B,C,10);

}

 

   

 

 

 

8.

#include <stdio.h>

int array_sum(int *A, int size)

{

int i, sum=0;

for (i = 0; i < size i++)

{

sum += A[i];

}

return sum;

}

int main()

{

int A[6] = {10,20,30,40,50,60};

printf("직원의월급총합계:%d\n", array_sum(A, 6));

}

 

 

 

 

 

9.

#include <stdio.h>

 

int search(int *A, int size, int search_value)

{

int i;

for (i = 0; i < size i++)

{

if (A[i] == search_value) {

return i;

break

}

}

}

int main()

{

int A[5] = { 100,150,180,200,250 };

printf("월급200만원은A[%d]\n", search(A, 5, 200));

}

 

   

 

 

 

10.

#include <stdio.h>

 

void get_lcm_gcd(int x, int y, int *p_lcm, int *p_gcd)

{

int temp,i;

i = x*y

while (x)

{

if (x>y)

x = x % y

else

{

temp = x x = y y = temp;

}

}

*p_gcd = y

*p_lcm = i/y

}

int main()

{

int gcd, lcm;

int x, y;

printf("2개의정수를입력하시오:");

scanf("%d %d", &x, &y);

get_lcm_gcd(x, y, &lcm, &gcd);

printf("최대공약수: %d\n", gcd);

printf("최소공배수: %d\n", lcm);

}

 

   

 

 

 

11.

#include <stdio.h>

void merge(int *A, int *B, int *C, int size)

{

int i,j=0,k=0;

for (i = 0; i < size i++)

{

if (j == 4)

{

while (k<size)

{

C[i++] = B[k++];

}

break;

}

else if (k == 4)

{

while (j<size)

{

C[i++] = A[j++];

}

break;

}

else if (A[j] > B[k])

{

C[i] = B[k];

k++;

}

else

{

C[i] = A[j];

j++;

}

}

}

int main()

{

int A[4] = { 2,5,7,8 };

int B[4] = { 1,3,4,6 };

int C[8] = { 0 };

int i;

merge(A, B, C, 8);

for (i = 0; i < 8; i++)

printf("%d ", C[i]);

printf("\n");

}

 

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2016/09/25 - [소스코드] - 쉽게 풀어쓴 C언어 express 9장 연습문제

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